void read(string, vector<string>&, vector<vector<double> >&);
double pythag(double, double);
void matrix_mult(vector<vector<double> >, vector<vector<double> >, vector<vector<double> >&);
void read(string, vector<string>&, vector<vector<double> >&);
double pythag(double, double);
void matrix_mult(vector<vector<double> >, vector<vector<double> >, vector<vector<double> >&);